public class Example4_20 {
	public static void main(String args[]) {
		char a[] = {'a','b','c','D','E','F'};
		for(int i = 0;i<a.length;i++) {
			if(Character.isLowerCase(a[i]))
				a[i]=Character.toUpperCase(a[i]);
			else if(Character.isUpperCase(a[i]))
				a[i]=Character.toLowerCase(a[i]);
		}
		for(int i=0;i<a.length;i++)
			System.out.print(" "+a[i]);
	}
}
